Qvfagundes

Data engineer. 17 years building production systems in fintech and ecommerce. I write about fraud detection, risk scoring, and recommendation engines — the engineering behind decisions that cost or m

Joined on Jun 19, 2025 vinicius@vf-insights.com https://www.vf-insights.com

Qvfagundes

May 15

Fraud Detection and Recommendation Are the Same Pipeline. Most Teams Build Two.

#architecture #dataengineering #machinelearning #systemdesign

3 min read

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Qvfagundes

May 14

Why Your Recommendation Engine Passes Every Test and Fails in Production

3 min read

Qvfagundes

May 11

Building Your First Data Warehouse in Databricks — End to End 🎉

#databricks #ai #dataengineering #datascience

7 min read

Qvfagundes

May 4

Medallion Architecture: Designing Bronze, Silver, and Gold Layers

#databricks #dataengineering #ai #datascience

6 min read

Qvfagundes

Apr 26

Delta Lakes: ACID Transactions, Time Travel & Delta Tables

#dataengineering #databricks #ai #datascience

6 min read

Qvfagundes

Apr 22

DataFrames & SQL in Databricks: Reading, Writing, and Transforming Data

#databricks #ai #database #dataengineering

6 min read

Qvfagundes

Apr 20

Databricks File System (DBFS) + Connecting to Cloud Storage

#databricks #data #ai #database

5 min read

Qvfagundes

Apr 13

Apache Spark in Plain English: The Engine Behind Databricks

#ai #dataengineering #spark

5 min read

Qvfagundes

Apr 6

Clusters & Notebooks: Your Databricks Workspace Explained

#databricks #python #ai #sql

5 min read

Qvfagundes

Apr 1

Setting Up Your Databricks Account (Free Trial + First Look at the UI)

#databricks #ai #dataengineering #python

4 min read

Qvfagundes

Mar 23

How Databricks Fits in the Modern Data Stack

#database #databricks #dataengineering #ai

4 min read

Qvfagundes

Mar 20

The problem Databricks was built to solve

#databricks #data #ai #dataengineering

3 min read

Qvfagundes

Feb 11

Charting Your Path: Courses and Resources to Accelerate Your Journey

#ai #data #beginners #career

5 min read

Qvfagundes

Feb 2

Building Your First Pipeline: From Concept to Execution

#dataengineering #python #career #beginners

8 min read

Qvfagundes

Jan 31

The Math You Actually Need as a Data Engineer

#datascience #career #beginners #python

6 min read

Qvfagundes

Jan 28

Tools of the Trade: What Powers Modern Data Engineering

#datascience #career #dataengineering #python

5 min read

Qvfagundes

Jan 27

Anomaly Detection + LLM: Statistical Rigor Meets AI Insights

#ai #dataengineering #python #programming

6 min read

Qvfagundes

Jan 23

Pipelines, ETL, and Warehouses: The DNA of Data Engineering

#dataengineering #datascience #beginners #career

4 min read

Qvfagundes

Jan 19

Data Engineering Uncovered: What It Is and Why It Matters

#dataengineering #beginners #data #career

3 min read

Qvfagundes

Jan 11

Real-Time is an SLA, Not an Architecture: When You Actually Need Kafka (And When You Don't)

#discuss #architecture #dataengineering #career

10 min read

Qvfagundes

Jan 10

Snowflake Cortex: The AI Layer Your Data Team Actually Needs

#snowflake #database #ai #llm

8 min read

Qvfagundes

Jan 9

Train Models. Ship Systems. Know the Difference.

#datascience #machinelearning

9 min read

Qvfagundes

Jan 7

Anomaly Detection in Seasonal Data: Why Z-Score Still Wins (But You Need to Use It Right)

#algorithms #datascience #machinelearning #python

11 min read

Qvfagundes

Dec 28 '25

Production AI: Monitoring, Cost Optimization, and Operations

#llm #dataengineering #mlops #machinelearning

9 min read

Qvfagundes

Dec 21 '25

RAG Evaluation Metrics: Measuring What Actually Matters

#llm #rag #dataengineering #ai

10 min read

Qvfagundes

Dec 16 '25

Human-in-the-Loop Systems: Building AI That Knows When to Ask for Help

#ai #rag #programming #data

17 min read

Qvfagundes

Dec 14 '25

Multi-Step Reasoning and Agentic Workflows: Building AI That Plans and Executes

#ai #rag #programming #webdev

16 min read

Qvfagundes

Dec 11 '25

Reranking and Two-Stage Retrieval: Precision When It Matters Most

#ai #llm #rag

2 min read

Qvfagundes

Dec 11 '25

Dense vs Sparse Retrieval: Mastering FAISS, BM25, and Hybrid Search

#ai #llm #vectordatabase

15 min read

Qvfagundes

Dec 8 '25

Chunking Strategies: The Art of Slicing Documents for Optimal RAG Performance

#ai #llm #data

10 min read

Qvfagundes

Dec 7 '25

Retrieval-Augmented Generation: Connecting LLMs to Your Data

#ai #datascience #llm #rag

10 min read

Qvfagundes

Dec 5 '25

Prompt Engineering Patterns: From Zero-Shot to Chain-of-Thought Reasoning

#ai #mcp #llm #dataengineering

14 min read

Qvfagundes

Dec 4 '25

Function Calling and Tool Use: Turning LLMs into Action-Taking Agents

#ai #llm #mcp #dataengineering

18 min read

Qvfagundes

Dec 2 '25

Positional Encodings and Context Window Engineering: Why Token Order Matters

#dataengineering #ai #software

12 min read

Qvfagundes

Nov 24 '25

Embeddings and Vector Similarity: How Machines Understand Meaning

#ai #datascience #dataengineering #llm

19 min read

Qvfagundes

Nov 21 '25

Transformers and Attention: How LLMs Actually Process Text

#ai #architecture #llm #deeplearning

19 min read

Qvfagundes

Nov 17 '25

Temperature, Tokens, and Context Windows: The Three Pillars of LLM Control

#ai #dataengineering #data #product

13 min read

Qvfagundes

Nov 6 '25

Building Custom MCP Servers with Python: A Data Engineer's Guide 🛠️

#dataengineering #software #python #ai

5 min read

Qvfagundes

Oct 22 '25

🏗️ Vector Database Architecture: How to Structure Your Data for Production RAG Systems

#architecture #llm #ai #database

3 min read

Qvfagundes

Oct 17 '25

🎓 Building a Smart LMS Assistant: RAG System with Pinecone for Multi-Source Learning Data

#vectordatabase #ai #dataengineering

3 min read

Qvfagundes

Oct 6 '25

When to Choose Scala Over Python for Apache Spark: A Performance-Driven Analysis

#datascience #dataengineering #ai

4 min read

Qvfagundes

Sep 30 '25

🎯 The Challenge: Processing TBs of S3 Data Without Breaking the Bank

#data #dataengineering #ai

5 min read

Qvfagundes

Sep 25 '25

🚀 Building a Sandbox Data Warehouse with Snowflake + GitHub Actions (Part 2)

3 min read

Qvfagundes

Sep 22 '25

🏗️ Building a Sandbox Data Warehouse with Snowflake + GitHub Actions (Part 1)

2 min read

Qvfagundes

Sep 15 '25

Managing Reference and Configuration Data in E-Commerce Data Platforms

3 min read

Qvfagundes

Aug 18 '25

🧊 Snowflake RBAC 101 – Episode 3: Ongoing Access Management

#dataengineering #datawarehouse #snowflake

1 min read

Qvfagundes

Aug 14 '25

Snowflake RBAC 101 – Episode 2: Role Hierarchies & Least Privilege

#dataengineering #dataprivacy #datawarehouse #snowflake

1 min read

Qvfagundes

Aug 11 '25

Snowflake RBAC 101

#snowflake #datascience #dataengineering #ai

1 min read

Qvfagundes

Aug 7 '25

🏗️ Designing Your Modern Data Platform (Cloud-Native Edition)

#dataplatform #datascience #dataengineering

2 min read

Qvfagundes

Aug 4 '25

🔐 Data Governance: From Chaos to Control

#dataengineering #datascience #architecture

2 min read

Qvfagundes

Jul 29 '25

🚦 Optimize Database Access and Efficiency with AWS RDS Proxy

2 min read

Qvfagundes

Jul 28 '25

🧭 Data Mesh vs Data Fabric (Part 2) – Real World Architectures & Code

1 min read

Qvfagundes

Jul 23 '25

🧭 Data Mesh vs Data Fabric (Part 1) – Rethinking How We Scale Data

#datamesh #dataengineering #datacatalog #architecture

2 min read

Qvfagundes

Jul 20 '25

🧱 OLTP vs OLAP: When Transaction Meets Analytics

#datafoundation #dataengineering #ai #sql

2 min read

Qvfagundes

Jul 16 '25

🛒 Real-Life Data Lakehouse Use Case: Revolutionizing Retail Analytics

#datascience #dataengineering #data #ai

2 min read

Qvfagundes

Jul 14 '25

🏗️ Data Lakehouse: Bridging Flexibility and Structure

#dataengineering #datascience #architecture

2 min read

Qvfagundes

Jul 10 '25

🧱 Data Lake, Data Warehouse, and Data Mart: What's the Difference?

2 min read

Qvfagundes

Jul 8 '25

🤖 Part 3: Building a Price Recommendation Engine with Pandas and Scikit-Learn

2 min read

Qvfagundes

Jul 7 '25

❄️ Part 2: ETL to Snowflake with AWS Glue — Enabling Price Index Modeling

2 min read

Qvfagundes

Jul 3 '25

🧠 Building a Serverless Price Indexer with AWS — From Web Crawling to Insights

2 min read

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